Does this class supposed to be inherrited or instantiated directly? Thanks Hilaire Le 28/01/2013 14:16, Guillaume Larcheveque a écrit :
look at PPExpressionParser class.
it's designed for that and you have a great example in the class comment
2013/1/28 Hilaire Fernandes <hilaire.fernandes@gmail.com <mailto:hilaire.fernandes@gmail.com>>
Hello
I try to extent the example of the arithmetic evaluator[1], I don't understand the magic underneath nor how you will make it works with substraction.
Changing method add to:
add ^ prod, ($+ asParser / $- asParser) trim, term
to parse mixture addition and substraction is wrong:
parser parse: '1 - 2 + 6' -> #(1 $- #(2 $+ 6))
The precedence is wrong.
How will you make it work? It seems to me the way to handle precedence in the example is not suited for extension
Thanks
Hilaire
[1] http://pharobooks.gforge.inria.fr/PharoByExampleTwo-Eng/latest/
-- *Guillaume Larcheveque*